EP0233572B1 - Transmission device - Google Patents
Transmission device Download PDFInfo
- Publication number
- EP0233572B1 EP0233572B1 EP87101768A EP87101768A EP0233572B1 EP 0233572 B1 EP0233572 B1 EP 0233572B1 EP 87101768 A EP87101768 A EP 87101768A EP 87101768 A EP87101768 A EP 87101768A EP 0233572 B1 EP0233572 B1 EP 0233572B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- operation pipe
- vibration isolator
- engine
- transmission device
- clutch housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/835—Mowers; Mowing apparatus of harvesters specially adapted for particular purposes
- A01D34/90—Mowers; Mowing apparatus of harvesters specially adapted for particular purposes for carrying by the operator
- A01D34/905—Vibration dampening means
Definitions
- the present invention relates generally to a transmission device for transmitting the torque of an engine to an output device, and particularly to a transmission device adopted for a working tool such as a weed cutter having an engine, a rotary blade, and a gear case for supporting the rotary blade rotatably, wherein the transmission device comprises an operation pipe for connecting the gear case with the engine and a transmission shaft disposed inside the operation pipe to transmit the engine torque to the rotary blade via the gear case.
- the transmission device of the present invention comprises a vibration isolator interposed between the operation pipe and a clutch housing of the engine.
- FIG. 2 is a view showing a vibration isolating connection between the operation pipe 7 and a clutch housing of the engine 5 according to the prior art.
- a vibration isolator 201 made of rubber, etc., for preventing vibrations generated by the engine 5 from propagating to the operation pipe 7 is fixed by burning or adhesion to the periphery of an inner cylinder 203.
- the inner cylinder 203 has grooves 205 and is engaged with an end of the operation pipe 7. After the engagement, the inner cylinder 203 is tightened by a clamp 207 at the grooves 205 such that the inner cylinder 203 is fixed to the operation pipe 7.
- the periphery of the vibration isolator 201 is provided with projections 209 formed in an axial direction to removably engage with grooves 211 formed in an axial direction on a cylindrical portion 213 of a clutch housing 215 of the engine 5.
- a transmission device for a working tool having an engine with a clutch housing, a rotary blade and a gear case for supporting said rotary blade, said transmission device comprising an operation pipe for connecting said engine with said gear case, a transmission shaft rotatably disposed inside operation pipe and extending along the total length of said operation pipe to transmit the torque of said engine to said rotary blade; and a vibration isolator having an outer surface and an inner surface interposed between said operation pipe and said clutch housing for preventing transmission vibration of the engine to the operation pipe.
- the vibration isolator of this prior art is built-up by two or one pair of annular vibration isolation parts made of rubber, which are disposed around the operation pipe between the operation pipe and the gear case.
- the transmission device of FR-A 2 559 342 has the disadvantage that according to the annular rubber rings, there is the danger that a relative movement between the operation pipe and the gear case occurs so that there is the possibility that there is movement of the gear case in respect to the operation pipe, rendering the transmission device inoperable.
- an object of the present invention to provide a transmission device for a working tool such as a weed cutter, in which safe operation is achieved by providing an appropriate vibration isolation between the gear case and the operation pipe.
- a safe function of the transmission device is achieved by providing notches in the operation pipe as well as in the clutch housing, so that rotation of said operation pipe with respect to the said clutch housing caused by vibration of the engine is prevented.
- a rotary blade 1 is rotatably supported by a gear case 3 and partly covered by a blade cover 4 which protects the rotary blade 1 from being damaged when the weed cutter 2 is placed on the ground.
- the blade 1 is connected via the gear case 3 with an engine 5 by an operation pipe 7.
- a fuel tank 6 is arranged on top of the engine 5.
- the weed cutter 2 is suspended from a shoulder of an operator through a shoulder band (not shown) attached to a hanger 20, and held by hands with grips 24 of a handle 25.
- the torque of the engine 5 is transmitted to the rotary blade 1 through the transmission shaft 15 to rotate the rotary blade 1.
- a reference numeral 21 represents a cable for performing a throttle operation.
- One end of the cable 21 is connected to a throttle lever 27, and the other end thereof enters into a hole formed on the operation pipe 7, passes through a hollow portion defined by the operation pipe 7, a bearing pipe, and adjacent support plates, comes out of another hole formed on the operation pipe 7, and is connected to a throttle device (not shown) of the engine 5. Due to this arrangement of the cable 21 inside the operation pipe 7, the cable 21 will not be caught by outside obstacles such as trees and twigs.
- FIG. 3 shows an embodiment of a vibration isolating connection according to the present invention.
- the same reference numerals as those shown in previous figures, particularly in Figs. 1 and 2 represent the corresponding parts.
- one end of a crank shaft 217 of the engine 5 is provided with a clutch 219 which is connected by a centrifugal force to a clutch drum 221 disposed adjacent to the periphery of the clutch 219.
- a boss portion 223 of the clutch drum 221 is supported by a bearing 225, which is supported by a bearing portion 227 of a clutch housing 215. Further, the bearing 225 is fitted to the bearing portion 227 by a snap ring 229.
- One end of the transmission shaft 15 is fitted to the boss portion 223 with a spline 231.
- Fixed by burning to the periphery of one end of the operation pipe 7 is a vibration isolator 201 made of rubber.
- the periphery of the vibration isolator 201 is provided with projections 209 extending in an axial direction.
- the projections 209 engage with grooves 211 provided in an axial direction on the inner surface of a cylindrical portion 213 of the clutch housing 215.
- An end portion of the cylindrical portion 213 is engaged with a cap 233 and fixed by a bolt 235.
- the vibration isolator 201 absorbs vibrations generated by the engine 5 to prevent them from being transmitted to the operation pipe 7.
- FIG 4 is a cross-sectional front view showing a modification of the vibration isolator.
- a vibration isolator 201'' is divided into two portions along a dividing plane in an axial direction, and inward projections 241 formed on the inner surface of the vibration isolator 201'' are fitted to notches 243 provided on an operation pipe 7'.
- Outward projections 245 formed on the outer surface of the vibration isolator 201'' are fitted to grooves 247 formed in an axial direction on the inner surface of a cylindrical portion 213''.
- the number of parts of the vibration isolating connection will be reduced to make the assembling work thereof easy, the total weight reduced, and the operation pipe held strongly to perform the cutting work smoothly.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Harvester Elements (AREA)
Description
- The present invention relates generally to a transmission device for transmitting the torque of an engine to an output device, and particularly to a transmission device adopted for a working tool such as a weed cutter having an engine, a rotary blade, and a gear case for supporting the rotary blade rotatably, wherein the transmission device comprises an operation pipe for connecting the gear case with the engine and a transmission shaft disposed inside the operation pipe to transmit the engine torque to the rotary blade via the gear case. The transmission device of the present invention comprises a vibration isolator interposed between the operation pipe and a clutch housing of the engine.
- Figured 2 is a view showing a vibration isolating connection between the
operation pipe 7 and a clutch housing of theengine 5 according to the prior art. In the figure, avibration isolator 201 made of rubber, etc., for preventing vibrations generated by theengine 5 from propagating to theoperation pipe 7 is fixed by burning or adhesion to the periphery of aninner cylinder 203. Theinner cylinder 203 has grooves 205 and is engaged with an end of theoperation pipe 7. After the engagement, theinner cylinder 203 is tightened by aclamp 207 at thegrooves 205 such that theinner cylinder 203 is fixed to theoperation pipe 7. The periphery of thevibration isolator 201 is provided withprojections 209 formed in an axial direction to removably engage withgrooves 211 formed in an axial direction on acylindrical portion 213 of aclutch housing 215 of theengine 5. - According to this arrangement of the prior art, there are many parts to be assembled for constituting the vibration isolating connection between the
operation pipe 7 and theclutch housing 215 of theengine 5 so that the assembling work may be bothersome, and the total weight increased. - From FR-A 2 559 342 a transmission device for a working tool is known, having an engine with a clutch housing, a rotary blade and a gear case for supporting said rotary blade, said transmission device comprising an operation pipe for connecting said engine with said gear case, a transmission shaft rotatably disposed inside operation pipe and extending along the total length of said operation pipe to transmit the torque of said engine to said rotary blade; and a vibration isolator having an outer surface and an inner surface interposed between said operation pipe and said clutch housing for preventing transmission vibration of the engine to the operation pipe.
- The vibration isolator of this prior art is built-up by two or one pair of annular vibration isolation parts made of rubber, which are disposed around the operation pipe between the operation pipe and the gear case.
- The transmission device of FR-A 2 559 342, however, has the disadvantage that according to the annular rubber rings, there is the danger that a relative movement between the operation pipe and the gear case occurs so that there is the possibility that there is movement of the gear case in respect to the operation pipe, rendering the transmission device inoperable.
- It is, therefore, an object of the present invention to provide a transmission device for a working tool such as a weed cutter, in which safe operation is achieved by providing an appropriate vibration isolation between the gear case and the operation pipe.
- This object is achieved by the characterizing part of
claim 1. - In particular, a safe function of the transmission device is achieved by providing notches in the operation pipe as well as in the clutch housing, so that rotation of said operation pipe with respect to the said clutch housing caused by vibration of the engine is prevented.
- These and other objects, features and advantages of the present invention will become apparent from the following descriptions of preferred embodiments taken in conjunction with the accompanying drawings in which:
- Fig. 1 is a perspective general view showing a weed cutter;
- Fig. 2 is a cross-sectional side view showing a vibration isolating connection according to a prior art;
- Fig. 3 is a cross-sectional side view showing an embodiment of a vibration isolating connection of the weed cutter according to the present invention; and
- Fig. 4 is a cross sectional front view showing a modification of the vibration isolating connection of the weed cutter according to the present invention.
- A first embodiment of the present invention will be described with reference to Fig. 1. In the figure, a
rotary blade 1 is rotatably supported by agear case 3 and partly covered by a blade cover 4 which protects therotary blade 1 from being damaged when the weed cutter 2 is placed on the ground. Theblade 1 is connected via thegear case 3 with anengine 5 by anoperation pipe 7. Afuel tank 6 is arranged on top of theengine 5. - In operation, the weed cutter 2 is suspended from a shoulder of an operator through a shoulder band (not shown) attached to a
hanger 20, and held by hands withgrips 24 of ahandle 25. The torque of theengine 5 is transmitted to therotary blade 1 through thetransmission shaft 15 to rotate therotary blade 1. - In Fig. 1, a
reference numeral 21 represents a cable for performing a throttle operation. One end of thecable 21 is connected to athrottle lever 27, and the other end thereof enters into a hole formed on theoperation pipe 7, passes through a hollow portion defined by theoperation pipe 7, a bearing pipe, and adjacent support plates, comes out of another hole formed on theoperation pipe 7, and is connected to a throttle device (not shown) of theengine 5. Due to this arrangement of thecable 21 inside theoperation pipe 7, thecable 21 will not be caught by outside obstacles such as trees and twigs. - Figure 3 shows an embodiment of a vibration isolating connection according to the present invention. In Fig. 3, the same reference numerals as those shown in previous figures, particularly in Figs. 1 and 2 represent the corresponding parts.
- In the figure, one end of a
crank shaft 217 of theengine 5 is provided with aclutch 219 which is connected by a centrifugal force to aclutch drum 221 disposed adjacent to the periphery of theclutch 219. Aboss portion 223 of theclutch drum 221 is supported by abearing 225, which is supported by a bearingportion 227 of aclutch housing 215. Further, thebearing 225 is fitted to thebearing portion 227 by asnap ring 229. One end of thetransmission shaft 15 is fitted to theboss portion 223 with aspline 231. Fixed by burning to the periphery of one end of theoperation pipe 7 is avibration isolator 201 made of rubber. The periphery of thevibration isolator 201 is provided withprojections 209 extending in an axial direction. Theprojections 209 engage withgrooves 211 provided in an axial direction on the inner surface of acylindrical portion 213 of theclutch housing 215. An end portion of thecylindrical portion 213 is engaged with acap 233 and fixed by abolt 235. - According to the above arrangement, when the
engine 5 is driven to carry out the cutting work of weeds and bushes by rotating therotary blade 1, thevibration isolator 201 absorbs vibrations generated by theengine 5 to prevent them from being transmitted to theoperation pipe 7. - Figure 4 is a cross-sectional front view showing a modification of the vibration isolator. In this modification, a vibration isolator 201'' is divided into two portions along a dividing plane in an axial direction, and
inward projections 241 formed on the inner surface of the vibration isolator 201'' are fitted tonotches 243 provided on an operation pipe 7'.Outward projections 245 formed on the outer surface of the vibration isolator 201'' are fitted togrooves 247 formed in an axial direction on the inner surface of a cylindrical portion 213''. - According to the above arrangement, in comparison with the vibration isolating connection of the prior art device shown in Fig. 2, the number of parts of the vibration isolating connection will be reduced to make the assembling work thereof easy, the total weight reduced, and the operation pipe held strongly to perform the cutting work smoothly.
Claims (4)
- A transmission device for a working tool such as a weed cutter having an engine (5) with clutch housing (215, 213), a rotary blade (1) and a gear case (3) for supporting said rotary blade (1), said transmission device comprising:
an operation pipe (7, 7') for connecting said engine (5) with said gear case (3);
a transmission shaft (15) rotatably disposed inside said operation pipe (7, 7') and extending along the total length of said operation pipe (7') to transmit the torque of said engine (5) to said rotary blade (1); and
a vibration isolator (201, 201', 201'') having an outer surface and an inner surface interposed between said operation pipe (7, 7') and said clutch housing (215, 213) for preventing transmitting vibration of the engine to the operation pipe;
characterized in that
said operation pipe (7') having an end around which a plurality of notches (243) are axially formed;
said clutch housing (215, 213) having an inner surface with a plurality of grooves (247) formed in the axial direction thereon; and
said vibration isolator (201'') is fixed onto the end of said operation pipe (7'), and said vibration isolator (201'') further comprising a plurality of inward projections (241) axially formed on said inner surface thereof so as to engage with said notches (243) of said operation pipe (7') and a plurality of outward projections (245) axially formed on said outer surface of said vibration isolator (201'') so as to removably engage with said grooves (247) of said clutch housing (213''). - A transmission device as claimed in claim 1, wherein said vibration isolator (201'') is heat-sealed to said operation pipe (7').
- A transmission device as claimed in claim 1, wherein said vibration isolator (201'') is divided into at least two portions along a dividing plane in an axial direction.
- A transmission device as claimed in claim 1, wherein the number of the notches (243) formed on the operation pipe (7') is two and the number of the grooves formed on the inner surface of the clutch housing is four, and the numbers of the inward and outward projections of the vibration isolator are corresponding to the numbers of the notches and the grooves, respectively.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18176/86 | 1986-02-13 | ||
JP1986018176U JPH062512Y2 (en) | 1986-02-13 | 1986-02-13 | Brush cutter |
JP5530786U JPH0324011Y2 (en) | 1986-04-15 | 1986-04-15 | |
JP55307/86 | 1986-04-15 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0233572A2 EP0233572A2 (en) | 1987-08-26 |
EP0233572A3 EP0233572A3 (en) | 1989-03-15 |
EP0233572B1 true EP0233572B1 (en) | 1993-05-12 |
Family
ID=26354820
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87101768A Expired - Lifetime EP0233572B1 (en) | 1986-02-13 | 1987-02-09 | Transmission device |
Country Status (4)
Country | Link |
---|---|
US (1) | US4759128A (en) |
EP (1) | EP0233572B1 (en) |
AU (1) | AU6862987A (en) |
DE (1) | DE3785774D1 (en) |
Families Citing this family (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5364307A (en) * | 1983-05-23 | 1994-11-15 | Vinylex Corporation | Coaxial drive cable centering apparatus |
EP0605129A1 (en) * | 1992-12-30 | 1994-07-06 | Kleineibst, Desmond | A device for extracting a plant from the ground |
US5345684A (en) * | 1993-01-25 | 1994-09-13 | Wci Outdoor Products, Inc. | Flexible line trimmer having an anti-vibration handle |
US5375666A (en) * | 1993-07-23 | 1994-12-27 | Ryobi Outdoor Products | Vibration isolator for a portable power tool |
US5607343A (en) * | 1994-08-22 | 1997-03-04 | Ryobi North America | Sander vibration isolator |
JPH09303354A (en) * | 1996-05-21 | 1997-11-25 | Kioritz Corp | Slipping off preventing structural body and bush cutter equipped therewith |
JPH1035319A (en) * | 1996-07-22 | 1998-02-10 | Kioritz Corp | Hand lever system |
US5810093A (en) * | 1996-10-03 | 1998-09-22 | Media Group | Multi-purpose landscaping device for use with a hand-held rotary power tool |
DE19654290A1 (en) | 1996-12-27 | 1998-07-02 | Dolmar Gmbh | Driving device for a lawn trimmer |
DE19654286A1 (en) | 1996-12-27 | 1998-07-02 | Dolmar Gmbh | Drive device for a brushcutter |
WO1999001022A1 (en) * | 1997-06-30 | 1999-01-14 | Hispaes, S.L. | Portable agricultural vibrating-collecting machine |
ES2152776B1 (en) * | 1997-06-30 | 2001-08-16 | Hispaes S L | ENGINE HOLDING SYSTEM FOR AGRICULTURAL, PORTABLE MACHINES, SUBJECTED TO OSCILLATION-VIBRATION. |
JP2916123B1 (en) | 1997-12-26 | 1999-07-05 | 川崎重工業株式会社 | Separation and coupling structure in work equipment |
JP2904767B1 (en) * | 1998-03-13 | 1999-06-14 | 大成工材株式会社 | Flexible shaft liner assembly and rotation transmission shaft |
DE19956332A1 (en) * | 1999-11-23 | 2001-05-31 | Stihl Maschf Andreas | Free cutter driven by internal combustion engine, with engine casing collar co-axially overlapping engine-side end of guide tube |
JP3778422B2 (en) * | 2001-03-01 | 2006-05-24 | 本田技研工業株式会社 | Brush cutter |
JP4537600B2 (en) * | 2001-03-06 | 2010-09-01 | 本田技研工業株式会社 | Brush cutter operation |
DE60202976T2 (en) * | 2001-02-27 | 2005-06-30 | Honda Giken Kogyo K.K. | Device for cutting plants |
JP3771514B2 (en) * | 2002-04-19 | 2006-04-26 | 本田技研工業株式会社 | Shaft structure of portable power work machine |
WO2004095907A1 (en) * | 2003-04-29 | 2004-11-11 | Gurri Molins Jose | Support and guide assembly for a rod which can perform an axial reciprocating movement |
JP4349579B2 (en) * | 2004-06-14 | 2009-10-21 | 本田技研工業株式会社 | Brush cutter |
US7070009B2 (en) * | 2004-06-18 | 2006-07-04 | Husqvarna Outdoor Products Inc. | Vibration isolation mount system (ISO) |
WO2006019889A1 (en) * | 2004-07-16 | 2006-02-23 | Mtd Products Inc | Flexible centering liner for hand-held tool |
JP5256151B2 (en) * | 2009-09-02 | 2013-08-07 | 株式会社マキタ | Brush cutter |
JP5841891B2 (en) * | 2012-04-18 | 2016-01-13 | 株式会社マキタ | Working machine |
JP2018068155A (en) * | 2016-10-26 | 2018-05-10 | 株式会社やまびこ | Portable bush cutter |
US11832564B2 (en) * | 2018-03-30 | 2023-12-05 | Honda Motor Co., Ltd. | Brush cutter |
IT201900004275A1 (en) * | 2019-03-25 | 2020-09-25 | Emak Spa | WORK TOOL EQUIPPED WITH A DAMPING ELEMENT |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB807415A (en) * | 1957-01-01 | 1959-01-14 | Fritz Menze | Improvements in or relating to the production of oscillation bearings |
US4006528A (en) * | 1974-11-22 | 1977-02-08 | Kaaz Machinery Co. Ltd. | Portable grass and brush cutter with brake and clutch |
US3977078A (en) * | 1975-06-17 | 1976-08-31 | Pittinger Jr Charles B | Grass cutting chain saw drive system |
US4126928A (en) * | 1977-04-18 | 1978-11-28 | Hoffco, Inc. | Method of making a shaft assembly |
DE2743043A1 (en) * | 1977-09-24 | 1979-04-05 | Stihl Maschf Andreas | PORTABLE WORK EQUIPMENT |
US4335585A (en) * | 1978-01-23 | 1982-06-22 | Hoffco, Inc. | Lawn trimmer construction |
US4226021A (en) * | 1978-10-19 | 1980-10-07 | Hoffco, Inc. | Shaft assembly for lawn trimmer |
US4286675A (en) * | 1979-06-25 | 1981-09-01 | Beaird-Poulan Division Of Emerson Electric Co. | Narrow profile power handle for line trimmer and the like |
FR2461843A1 (en) * | 1979-07-23 | 1981-02-06 | Seim | DEVICE FOR REMOTE CONTROL BY CABLE OF ANOTHER ORGAN AND VEHICLE EQUIPPED WITH SUCH A DEVICE |
US4451983A (en) * | 1979-11-19 | 1984-06-05 | Emerson Electric Co. | Plastic flexible shaft support |
JPS60131117U (en) * | 1984-02-14 | 1985-09-02 | 株式会社共立 | Brush cutter transmission device |
JPS60156923U (en) * | 1984-03-29 | 1985-10-18 | 株式会社共立 | brush cutter |
-
1987
- 1987-02-09 DE DE8787101768T patent/DE3785774D1/en not_active Expired - Fee Related
- 1987-02-09 US US07/012,449 patent/US4759128A/en not_active Expired - Lifetime
- 1987-02-09 EP EP87101768A patent/EP0233572B1/en not_active Expired - Lifetime
- 1987-02-10 AU AU68629/87A patent/AU6862987A/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
DE3785774D1 (en) | 1993-06-17 |
AU6862987A (en) | 1987-08-20 |
EP0233572A2 (en) | 1987-08-26 |
DE3785774T2 (en) | 1993-08-12 |
US4759128A (en) | 1988-07-26 |
EP0233572A3 (en) | 1989-03-15 |
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